Problem: Native Resolution of Internal LCD not automatically supported
If your laptop panel has an unusual native resolution such as 1400x1050, and the native resolution is not automatically supported, and if your video adapter is something like Intel 915GM you may need to download and install the program 915resolution, read the documentation and add a line into /etc/rc.local such as:
915resolution 3c 1400 1050
and then configure /etc/X11/xorg.conf with care... see x.org FAQVideoModes.
Restart X without an external monitor attached, or use an external monitor having the same or higher resolution than the laptop panel. As of xorg 7.0, the external monitor is probed for its limits and xorg will refuse to allow the internal LCD to be driven at resolutions higher than the external monitor will allow. This can happen even if the external monitor is off, so unplug the external monitor!
Rumors suggest that future updates to xorg will make this unnecessary. Since this is fundamentally a hardware problem (the video adapter does not properly report the ability to drive this mode) it will be a pleasant surprise if it happens.
Thinkpad R52 Model 1859-4AU